The statement which best reflects the main goal of the Free-Soil Party is option A. lavery must not be allowed to spread to western territories.
The Free Soil Party was political party in the United States which did not last so long. It was active in the 1848 and 1852 presidential elections as well as in some state elections.
The party arised in New York following the state Democratic convention refusal to endorse the Wilmot Proviso, a la proposed in order to prohibit slavery in any territory acquired from Mexico in the Mexican–American War.